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Performance of Shell-aggregates from Different Siliceous Materials and Its Concrete


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Performance of Shell-aggregates from Different Siliceous Materials and Its Concrete
MA Hai-long12CUI Chong1SUN Zhang-ao1
1.School of Materials Science and Engineering,NUST,Nanjing 210094,China; 2.Institute of Ethnic Preparatory Education,Ningxia University,Yinchuan 750021,China
propylene oxide sludges clay bricks fly ashes diatomites powdery quartz sands aggregates strength loss rates
Fly ash,waste clay brick,diatomite and powdery quartz sand are used as siliceous materials to prepare propylene oxide sludge shell-aggregates under the condition of autoclaved(180 ℃,1.0 MPa)curing.The physical and mechanical performance of shell-aggregates from propylene oxide sludge and different siliceous materials and its concrete is investigated by the X-ray diffraction and scanning electron microscopy.The results indicate that all these siliceous materials can react with Ca(OH)2 contained in propylene oxide sludge and can be used to prepare high-performance aggregates used in load-bearing structures.Better aggregate forming can be observed in experiment when a given number of waste clay bricks,diatomites or powdery quartz sands are added in fly ash.The highest compressive strength of semi-lightweight concrete using propylene oxide sludge shell-aggregates as coarse aggregates can reach 81.5 MPa.Aggregates contained in concrete are in a condition of three-dimensional stress and thus strength loss rate of concrete is lower than that of a single aggregate when other siliceous materials are added in fly ash.


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Last Update: 2012-10-12